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| author | aurel32 | 2008-11-01 01:54:33 +0100 |
|---|---|---|
| committer | aurel32 | 2008-11-01 01:54:33 +0100 |
| commit | 6176a26d1d0fe40dea0fd6a4e1a437931cbdcb2d (patch) | |
| tree | 333a8cce25a64f84d601f40dafbe03172467b130 | |
| parent | target-ppc: convert 405 MAC instructions to TCG (diff) | |
| download | qemu-6176a26d1d0fe40dea0fd6a4e1a437931cbdcb2d.tar.gz qemu-6176a26d1d0fe40dea0fd6a4e1a437931cbdcb2d.tar.xz qemu-6176a26d1d0fe40dea0fd6a4e1a437931cbdcb2d.zip | |
target-ppc: optimize popcntb
Suggested by Andrzej Zaborowski.
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5592 c046a42c-6fe2-441c-8c8c-71466251a162
| -rw-r--r-- | target-ppc/op_helper.c | 22 |
1 files changed, 8 insertions, 14 deletions
diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c index ef1035fc56..b1a88b5271 100644 --- a/target-ppc/op_helper.c +++ b/target-ppc/op_helper.c @@ -222,25 +222,19 @@ target_ulong helper_srad (target_ulong value, target_ulong shift) target_ulong helper_popcntb (target_ulong val) { - uint32_t ret; - int i; - - ret = 0; - for (i = 0; i < 32; i += 8) - ret |= ctpop8((val >> i) & 0xFF) << i; - return ret; + val = (val & 0x55555555) + ((val >> 1) & 0x55555555); + val = (val & 0x33333333) + ((val >> 2) & 0x33333333); + val = (val & 0x0f0f0f0f) + ((val >> 4) & 0x0f0f0f0f); + return val; } #if defined(TARGET_PPC64) target_ulong helper_popcntb_64 (target_ulong val) { - uint64_t ret; - int i; - - ret = 0; - for (i = 0; i < 64; i += 8) - ret |= ctpop8((val >> i) & 0xFF) << i; - return ret; + val = (val & 0x5555555555555555ULL) + ((val >> 1) & 0x5555555555555555ULL); + val = (val & 0x3333333333333333ULL) + ((val >> 2) & 0x3333333333333333ULL); + val = (val & 0x0f0f0f0f0f0f0f0fULL) + ((val >> 4) & 0x0f0f0f0f0f0f0f0fULL); + return val; } #endif |